I understand that you are having some issues with your Slingbox AV since it stopped working all of a sudden.
Even though you have already applied some troubleshooting steps we recommend you to apply a hard-reset to your Slingbox. If you do not know how to, just check this link:
Then, use the Slingbox Classic Power Adapter. Since these units use the same Power Adapter, this will be a good troubleshooting step to apply. If it works, you'll need to get a new Power Adapter for the Slingbox Classic:
If your Slingbox Classic does not respond, it means that your Slingbox is likely "dead".
If this is the case, we recommend you to get either the Slingbox SOLO or the Slingbox PRO-HD:
Hope this helps.
Thanks for taking a stab at my problem, but I'm still trying to understand if port scanning is a normal function of the SlingboxAV. I had already tried your suggestions of hard-reset, power supply swap, etc. The box doesn't appear to be "dead", as it responds to network activity - it just isn't reponding in a way consistent with other Slingboxes. I'm wondering if it's stuck in some type of debug/test mode and assume that at least someone out there can use a packet sniffer to see if there box does the same thing.